Bug 1090752

Summary:	Scrolling in libreoffice writer is really slow and seems to make Xorg take up a lot of CPU
Product:	[Fedora] Fedora	Reporter:	Ankur Sinha (FranciscoD) <sanjay.ankur>
Component:	libreoffice	Assignee:	Caolan McNamara <caolanm>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	20	CC:	caolanm, cunha17, dtardon, erack, everheul, ltinkl, mari+bugzilla, mstahl, sbergman
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-08-07 13:54:08 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Ankur Sinha (FranciscoD) 2014-04-24 05:22:24 UTC

Description of problem:
I'm proof reading a 21 page document in libreoffice writer. It is a research paper and contains quite a few graphs etc. Scrolling in writer is painfully slow, makes libreoffice unresponsive quite a few times. When libreoffice is unresponsive, looking at htop tells me that Xorg is consuming high CPU cycles. Sometimes, just clicking on the document to make a change also causes this.

I've tried both touchpad scrolling and using the libreoffice buttons (navigator mode and the button in the right bottom corner.)

I've increased the image cache as suggested here:
http://ask.libreoffice.org/en/question/93/images-slow-down-performace/

Version-Release number of selected component (if applicable):
libreoffice-writer-4.2.3.3-6.fc20.x86_64

How reproducible:
Frequently

Steps to Reproduce:
1. Open a large document with figures
2. Scroll, click, use normally.
3.

Actual results:
Gets hung frequently. 

Expected results:
Should scroll seamlessly without getting hung again and again

Additional info:
xorg-x11-server-Xorg-1.14.4-7.fc20.x86_64

fpaste --sysinfo output -> http://paste.fedoraproject.org/96462/31683713


Unfortunately, the document is a research paper under review and I cannot attach it to the bugreport yet.

Comment 1 mari+bugzilla 2014-05-27 15:55:56 UTC

That's no specific problem with redhat or the Xserver. I have the same problem with ubuntu 14.04. In fact at this time LibreOffice is unusable with big images (e.g. 600dpi full page gray tiff).

Today I verified that OpenOffice 4.1 does not have this problem. Same images are scrolling more then 10 times faster and I saw a message from another user who sayed that this bug in LibreOffice started with version 4.0 while version 3.6 is as fast as OpenOffice.

Comment 2 Michael Stahl 2014-08-07 13:54:08 UTC

the slow scrolling in writer when images are visible was fixed
in releases LO 4.2.6 and 4.3.1

Comment 3 mari+bugzilla 2015-04-20 14:09:11 UTC

because of the comment of michael i did the same test again using LO 4.3.6 and 4.4.2. Unfortunally the slow scrolling hasn't gone away. Either the bug was reintroduced again after version 4.3.1 or we are talking about different bugs.

Comment 4 Erik Verheul 2015-10-30 16:22:11 UTC

This problem still exists in Version: 5.0.2.2. Both in Write and Calc.

Comment 5 Cristiano Duarte 2016-01-28 16:48:07 UTC

(In reply to Michael Stahl from comment #2)
> the slow scrolling in writer when images are visible was fixed
> in releases LO 4.2.6 and 4.3.1

Please reopen this bug report, because this problem still exists in Version 5.0.4.2-3 of LibreOffice.

System:
  - HP Z620 Workstation 2 Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz (12 cores) with 16GB RAM
  - Fedora Core 23 x86_64
  - libreoffice-writer-5.0.4.2-3.fc23.x86_64

Scrolling a document with 38 pages is lagging, and while it happens the Xorg process CPU usage stays between 60% and 100%, depending on what is being rendered by Libreoffice.
Tried to increase memory configurations in Libreoffice, but it didn't help with the scrolling lags and slow rendering.

Here are the reports using different configurations of hardware acceleration, antialiasing and OpenGL:

a) with HA=off AA=off and OGL=off
scrolling lags a bit and rendering is slow. Xorg, while scrolling, stays at 60% CPU.

b) with HA=on AA=off and OGL=off
scrolling lags a bit and rendering is slow. Xorg, while scrolling, stays at 60% CPU.

c) with HA=on AA=on and OGL=off
scrolling lags and rendering is slow. Xorg, while scrolling, stays at 73% CPU.

d) with HA=on AA=on and OGL=on
scrolling lags and rendering is slow. Xorg, while scrolling, stays at 75% CPU.

e) with HA=on AA=on and OGL=on (and force OGL=on)
scrolling lags and rendering is slow. Xorg, while scrolling, stays at 75% CPU.

The document does not have big images. Some info on the document used:

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---------                     -------
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Comment 6 David Tardon 2016-01-29 08:40:59 UTC

Please open a new bug instead of reusing an old closed one that looks similar.